Six million gallons of oil have been dumped into the Gulf of Mexico since a Louisiana rig exploded and sank there on April 20.

Louisiana oil spill

One of three leaks at a ruptured well spewing oil into the Gulf of Mexico has been capped, officials announced on May 5. The Coast Guard says oil company BP has managed to cap one of three leaks at a deepwater oil well, but the work is not likely to significantly reduce the overall flow of oil into the Gulf.

Above, heavy oil is seen in the water near the Chandeleur Islands, La. on May 4.